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1 | office | 1 | /** |
2 | * @file net_backend_waitdevice.c |
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3 | * @author Ambroz Bizjak <ambrop7@gmail.com> |
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4 | * |
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5 | * @section LICENSE |
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6 | * |
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7 | * Redistribution and use in source and binary forms, with or without |
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8 | * modification, are permitted provided that the following conditions are met: |
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9 | * 1. Redistributions of source code must retain the above copyright |
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10 | * notice, this list of conditions and the following disclaimer. |
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11 | * 2. Redistributions in binary form must reproduce the above copyright |
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12 | * notice, this list of conditions and the following disclaimer in the |
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13 | * documentation and/or other materials provided with the distribution. |
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14 | * 3. Neither the name of the author nor the |
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15 | * names of its contributors may be used to endorse or promote products |
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16 | * derived from this software without specific prior written permission. |
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17 | * |
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18 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND |
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19 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
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20 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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21 | * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY |
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22 | * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
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23 | * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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24 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
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25 | * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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26 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
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27 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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28 | * |
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29 | * @section DESCRIPTION |
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30 | * |
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31 | * Module which waits for the presence of a network interface. |
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32 | * |
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33 | * Synopsis: net.backend.waitdevice(string ifname) |
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34 | * Description: statement is UP when a network interface named ifname |
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35 | * exists, and DOWN when it does not. |
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36 | */ |
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37 | |||
38 | #include <stdlib.h> |
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39 | #include <string.h> |
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40 | #include <regex.h> |
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41 | |||
42 | #include <misc/parse_number.h> |
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43 | #include <ncd/extra/NCDIfConfig.h> |
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44 | |||
45 | #include <ncd/module_common.h> |
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46 | |||
47 | #include <generated/blog_channel_ncd_net_backend_waitdevice.h> |
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48 | |||
49 | #define DEVPATH_REGEX "/net/[^/]+$" |
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50 | |||
51 | struct instance { |
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52 | NCDModuleInst *i; |
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53 | MemRef ifname; |
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54 | NCDUdevClient client; |
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55 | regex_t reg; |
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56 | char *devpath; |
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57 | uintmax_t ifindex; |
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58 | }; |
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59 | |||
60 | static void client_handler (struct instance *o, char *devpath, int have_map, BStringMap map) |
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61 | { |
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62 | if (o->devpath && !strcmp(devpath, o->devpath) && !NCDUdevManager_Query(o->i->params->iparams->umanager, o->devpath)) { |
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63 | // free devpath |
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64 | free(o->devpath); |
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65 | |||
66 | // set no devpath |
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67 | o->devpath = NULL; |
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68 | |||
69 | // signal down |
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70 | NCDModuleInst_Backend_Down(o->i); |
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71 | } else { |
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72 | const BStringMap *cache_map = NCDUdevManager_Query(o->i->params->iparams->umanager, devpath); |
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73 | if (!cache_map) { |
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74 | goto out; |
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75 | } |
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76 | |||
77 | int match_res = regexec(&o->reg, devpath, 0, NULL, 0); |
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78 | const char *interface = BStringMap_Get(cache_map, "INTERFACE"); |
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79 | const char *ifindex_str = BStringMap_Get(cache_map, "IFINDEX"); |
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80 | |||
81 | uintmax_t ifindex; |
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82 | if (!(!match_res && interface && MemRef_Equal(MemRef_MakeCstr(interface), o->ifname) && ifindex_str && parse_unsigned_integer(MemRef_MakeCstr(ifindex_str), &ifindex))) { |
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83 | goto out; |
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84 | } |
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85 | |||
86 | if (o->devpath && (strcmp(o->devpath, devpath) || o->ifindex != ifindex)) { |
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87 | // free devpath |
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88 | free(o->devpath); |
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89 | |||
90 | // set no devpath |
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91 | o->devpath = NULL; |
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92 | |||
93 | // signal down |
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94 | NCDModuleInst_Backend_Down(o->i); |
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95 | } |
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96 | |||
97 | if (!o->devpath) { |
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98 | // grab devpath |
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99 | o->devpath = devpath; |
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100 | devpath = NULL; |
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101 | |||
102 | // remember ifindex |
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103 | o->ifindex = ifindex; |
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104 | |||
105 | // signal up |
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106 | NCDModuleInst_Backend_Up(o->i); |
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107 | } |
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108 | } |
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109 | |||
110 | out: |
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111 | free(devpath); |
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112 | if (have_map) { |
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113 | BStringMap_Free(&map); |
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114 | } |
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115 | } |
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116 | |||
117 | static void func_new (void *vo, NCDModuleInst *i, const struct NCDModuleInst_new_params *params) |
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118 | { |
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119 | struct instance *o = vo; |
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120 | o->i = i; |
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121 | |||
122 | // check arguments |
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123 | NCDValRef arg; |
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124 | if (!NCDVal_ListRead(params->args, 1, &arg)) { |
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125 | ModuleLog(o->i, BLOG_ERROR, "wrong arity"); |
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126 | goto fail0; |
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127 | } |
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128 | if (!NCDVal_IsStringNoNulls(arg)) { |
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129 | ModuleLog(o->i, BLOG_ERROR, "wrong type"); |
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130 | goto fail0; |
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131 | } |
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132 | o->ifname = NCDVal_StringMemRef(arg); |
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133 | |||
134 | // init client |
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135 | NCDUdevClient_Init(&o->client, o->i->params->iparams->umanager, o, (NCDUdevClient_handler)client_handler); |
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136 | |||
137 | // compile regex |
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138 | if (regcomp(&o->reg, DEVPATH_REGEX, REG_EXTENDED)) { |
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139 | ModuleLog(o->i, BLOG_ERROR, "regcomp failed"); |
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140 | goto fail1; |
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141 | } |
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142 | |||
143 | // set no devpath |
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144 | o->devpath = NULL; |
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145 | return; |
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146 | |||
147 | fail1: |
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148 | NCDUdevClient_Free(&o->client); |
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149 | fail0: |
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150 | NCDModuleInst_Backend_DeadError(i); |
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151 | } |
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152 | |||
153 | static void func_die (void *vo) |
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154 | { |
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155 | struct instance *o = vo; |
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156 | |||
157 | // free devpath |
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158 | if (o->devpath) { |
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159 | free(o->devpath); |
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160 | } |
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161 | |||
162 | // free regex |
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163 | regfree(&o->reg); |
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164 | |||
165 | // free client |
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166 | NCDUdevClient_Free(&o->client); |
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167 | |||
168 | NCDModuleInst_Backend_Dead(o->i); |
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169 | } |
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170 | |||
171 | static struct NCDModule modules[] = { |
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172 | { |
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173 | .type = "net.backend.waitdevice", |
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174 | .func_new2 = func_new, |
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175 | .func_die = func_die, |
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176 | .alloc_size = sizeof(struct instance) |
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177 | }, { |
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178 | .type = NULL |
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179 | } |
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180 | }; |
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181 | |||
182 | const struct NCDModuleGroup ncdmodule_net_backend_waitdevice = { |
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183 | .modules = modules |
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184 | }; |